[1.7/stable] Vault fails "secrets-relation-changed" hook due to internal error

Bug #2035969 reported by Bas de Bruijne
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vault-charm
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Bug Description

In test run https://solutions.qa.canonical.com/testruns/e7cd99d1-29e4-4768-b498-0bb3bea45f17, which tests kubernetes on focal AWS with the following versions:
======
juju 3.1.5
fce-container-image ubuntu:jammy
legacy-lma stable
charmed-kubernetes 1.28
vault 1.7/stable 178
======

vault fails in the "secrets-relation-changed" hook when installing. The expected behaviour is that the vault installs without reporting failures.

In the debug-log we see the following error:
======
unit-vault-0: 07:27:29 ERROR unit.vault/0.juju-log secrets:59: Hook error:
Traceback (most recent call last):
  File "/var/lib/juju/agents/unit-vault-0/.venv/lib/python3.8/site-packages/charms/reactive/__init__.py", line 74, in main
    bus.dispatch(restricted=restricted_mode)
  File "/var/lib/juju/agents/unit-vault-0/.venv/lib/python3.8/site-packages/charms/reactive/bus.py", line 390, in dispatch
    _invoke(other_handlers)
  File "/var/lib/juju/agents/unit-vault-0/.venv/lib/python3.8/site-packages/charms/reactive/bus.py", line 359, in _invoke
    handler.invoke()
  File "/var/lib/juju/agents/unit-vault-0/.venv/lib/python3.8/site-packages/charms/reactive/bus.py", line 181, in invoke
    self._action(*args)
  File "/var/lib/juju/agents/unit-vault-0/charm/reactive/vault_handlers.py", line 519, in configure_secrets_backend
    client.auth_approle(charm_role_id)
  File "/var/lib/juju/agents/unit-vault-0/.venv/lib/python3.8/site-packages/hvac/v1/__init__.py", line 2072, in auth_approle
    return self.auth('/v1/auth/{0}/login'.format(mount_point), json=params, use_token=use_token)
  File "/var/lib/juju/agents/unit-vault-0/.venv/lib/python3.8/site-packages/hvac/v1/__init__.py", line 1726, in auth
    return self._adapter.auth(
  File "/var/lib/juju/agents/unit-vault-0/.venv/lib/python3.8/site-packages/hvac/adapters.py", line 159, in auth
    response = self.post(url, **kwargs).json()
  File "/var/lib/juju/agents/unit-vault-0/.venv/lib/python3.8/site-packages/hvac/adapters.py", line 103, in post
    return self.request('post', url, **kwargs)
  File "/var/lib/juju/agents/unit-vault-0/.venv/lib/python3.8/site-packages/hvac/adapters.py", line 233, in request
    utils.raise_for_error(response.status_code, text, errors=errors)
  File "/var/lib/juju/agents/unit-vault-0/.venv/lib/python3.8/site-packages/hvac/utils.py", line 39, in raise_for_error
    raise exceptions.InternalServerError(message, errors=errors)
hvac.exceptions.InternalServerError: internal error
======

This looks similar to LP: 1883263

For logs and crashdumps, see: https://oil-jenkins.canonical.com/artifacts/e7cd99d1-29e4-4768-b498-0bb3bea45f17/index.html

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